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Diffstat (limited to 'src/foundation/StrConvertUTF.h')
| -rw-r--r-- | src/foundation/StrConvertUTF.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/src/foundation/StrConvertUTF.h b/src/foundation/StrConvertUTF.h new file mode 100644 index 0000000..965867c --- /dev/null +++ b/src/foundation/StrConvertUTF.h @@ -0,0 +1,213 @@ +/**************************************************************************** +** +** Copyright (C) 1993-2009 NVIDIA Corporation. +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of Qt 3D Studio. +** +** $QT_BEGIN_LICENSE:GPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3 or (at your option) any later version +** approved by the KDE Free Qt Foundation. The licenses are as published by +** the Free Software Foundation and appearing in the file LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#pragma once +#ifndef QT3DS_RENDER_STR_CONVERT_UTF_H +#define QT3DS_RENDER_STR_CONVERT_UTF_H +#include <EASTL/string.h> +#include "foundation/ConvertUTF.h" +#include "foundation/Qt3DSAssert.h" +#include "foundation/Qt3DSSimpleTypes.h" + +namespace qt3ds { +namespace foundation { + + using namespace qt3ds; + template <typename TSrcType> + struct ConverterType + { + }; + template <> + struct ConverterType<char8_t> + { + typedef UTF8 TConverterType; + }; + template <> + struct ConverterType<char16_t> + { + typedef UTF16 TConverterType; + }; + template <> + struct ConverterType<char32_t> + { + typedef UTF32 TConverterType; + }; + + template <QT3DSU32 TWCharSize> + struct WCharType + { + }; + + template <> + struct WCharType<2> + { + typedef char16_t TCharType; + }; + + template <> + struct WCharType<4> + { + typedef char32_t TCharType; + }; + + typedef WCharType<sizeof(wchar_t)> TWCharEASTLConverter; + + template <typename TSrcType, typename TDestType> + struct UTFConversionSelector + { + }; + + template <> + struct UTFConversionSelector<char8_t, char16_t> + { + static ConversionResult Convert(const UTF8 **sourceStart, const UTF8 *sourceEnd, + UTF16 **targetStart, UTF16 *targetEnd, + ConversionFlags flags) + { + return Q3DSConvertUTF8toUTF16(sourceStart, sourceEnd, targetStart, targetEnd, flags); + } + }; + + template <> + struct UTFConversionSelector<char8_t, char32_t> + { + static ConversionResult Convert(const UTF8 **sourceStart, const UTF8 *sourceEnd, + UTF32 **targetStart, UTF32 *targetEnd, + ConversionFlags flags) + { + return Q3DSConvertUTF8toUTF32(sourceStart, sourceEnd, targetStart, targetEnd, flags); + } + }; + template <> + struct UTFConversionSelector<char16_t, char8_t> + { + static ConversionResult Convert(const UTF16 **sourceStart, const UTF16 *sourceEnd, + UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags) + { + return Q3DSConvertUTF16toUTF8(sourceStart, sourceEnd, targetStart, targetEnd, flags); + } + }; + template <> + struct UTFConversionSelector<char16_t, char32_t> + { + static ConversionResult Convert(const UTF16 **sourceStart, const UTF16 *sourceEnd, + UTF32 **targetStart, UTF32 *targetEnd, + ConversionFlags flags) + { + return Q3DSConvertUTF16toUTF32(sourceStart, sourceEnd, targetStart, targetEnd, flags); + } + }; + template <> + struct UTFConversionSelector<char32_t, char8_t> + { + static ConversionResult Convert(const UTF32 **sourceStart, const UTF32 *sourceEnd, + UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags) + { + return Q3DSConvertUTF32toUTF8(sourceStart, sourceEnd, targetStart, targetEnd, flags); + } + }; + template <> + struct UTFConversionSelector<char32_t, char16_t> + { + static ConversionResult Convert(const UTF32 **sourceStart, const UTF32 *sourceEnd, + UTF16 **targetStart, UTF16 *targetEnd, + ConversionFlags flags) + { + return Q3DSConvertUTF32toUTF16(sourceStart, sourceEnd, targetStart, targetEnd, flags); + } + }; + + // Convert into an EASTL string type. + // inSrcLen may be zero in which case we analyze the string looking for the zero element. + template <typename TSrcType, typename TDestType, typename TAllocType> + bool ConvertUTF(const TSrcType *inSrc, size_t inSrcLen, + eastl::basic_string<TDestType, TAllocType> &outString) + { + typedef typename ConverterType<TDestType>::TConverterType TDestUTFType; + typedef typename ConverterType<TSrcType>::TConverterType TSrcUTFType; + if (inSrc == 0 || *inSrc == 0) { + outString.clear(); + return true; + } + + if (inSrcLen == 0) { + // empty loop intentional. + for (const TSrcType *ptr = inSrc; ptr && *ptr; ++ptr, ++inSrcLen) { + } + } + + typename eastl::basic_string<TDestType, TAllocType>::size_type capacity = + outString.capacity(); + if (capacity == 0) + outString.resize((QT3DSU32)inSrcLen * 2); + else + outString.resize(capacity); + + ConversionResult theConversionResult(conversionOK); + TDestUTFType *writePtr = NULL; + do { + writePtr = reinterpret_cast<TDestUTFType *>(const_cast<TDestType *>(outString.data())); + TDestUTFType *writeEnd(writePtr + outString.size()); + const TSrcUTFType *readPtr(reinterpret_cast<const TSrcUTFType *>(inSrc)); + const TSrcUTFType *readEnd = readPtr + inSrcLen; + theConversionResult = UTFConversionSelector<TSrcType, TDestType>::Convert( + &readPtr, readEnd, &writePtr, writeEnd, lenientConversion); + if (theConversionResult == targetExhausted) { + capacity = outString.capacity() * 2; + outString.resize(capacity); + } + } while (theConversionResult == targetExhausted); + + if (theConversionResult == conversionOK) { + TDestUTFType *writeStart = + reinterpret_cast<TDestUTFType *>(const_cast<TDestType *>(outString.data())); + outString.resize((QT3DSU32)(writePtr - writeStart)); + return true; + } else { + outString.clear(); + QT3DS_ASSERT(false); + return false; + } + } + +#ifdef WIDE_IS_DIFFERENT_TYPE_THAN_CHAR16_T + + template <typename TDestType, typename TAllocType> + bool ConvertWideUTF(const wchar_t *inSrc, size_t inSrcLen, + eastl::basic_string<TDestType, TAllocType> &outString) + { + return ConvertUTF((const TWCharEASTLConverter::TCharType *)inSrc, inSrcLen, outString); + } + +#endif +} +} + +#endif |